Final answer:
The question refers to influential band leaders and singers of the 20th century, like the King and Carter Jazzing Orchestra and Sam Cooke, who captivated audiences and played significant roles in cultural and musical movements, including the civil rights movement and the popularization of jazz and soul.
Step-by-step explanation:
The subject in question pertains to a band leader and singer who played a vital role in the evolution of American music. This individual led a band that was particularly famous in the 1920s and appealed to young, hip, and predominantly white audiences. Such bands, like the King and Carter Jazzing Orchestra shown in Figure 1, were instrumental in drawing diverse audiences to jazz, a genre deeply rooted in African-American culture.
Among the iconic figures of this musical revolution was Sam Cooke, also known as the "King of Soul," who began his career with the Soul Stirrers and later moved on to create music with strong themes related to the civil rights movement. Another trailblazer was Elvis Presley, a youth from Memphis whose first record with Sun Records was a groundbreaking blend of multiple musical styles, including R&B, bluegrass, and country.
The transformative power of such musicians was evident in their widespread appeal and influence across different social demographics, introducing new musical styles to the mainstream and contributing significantly to cultural shifts in America during their respective eras.